Entangling atomic spins with a Rydberg-dressed spin-flip blockade

By Y. Jau, A. Hankin, T. Keating, Ivan H. Deutsch, G. Biedermann. Nature Physics, 2015

347 citations recorded by the source corpus.

Controlling the quantum entanglement between parts of a many-body system is key to unlocking the power of quantum technologies such as quantum computation, high-precision sensing, and the simulation of many-body physics. The spin degrees of freedom of ultracold neutral atoms in their ground electronic state provide a natural platform for such applications thanks to their long coherence times and the ability to control them with magneto-optical fields. However, the creation of strong coherent coupling between spins has been challenging. Here we demonstrate a strong and tunable Rydberg-dressed interaction between spins of individually trapped caesium atoms with energy shifts of order 1 MHz in units of Planck’s constant. This interaction leads to a ground-state spin-flip blockade, whereby simultaneous hyperfine spin flips of two atoms are inhibited owing to their mutual interaction. We employ this spin-flip blockade to rapidly produce single-step Bell-state entanglement between two atoms with a fidelity ≥81(2)%. Tunable interactions in quantum many-body systems have practical applications in quantum technologies. The effective spin-dependent long-range interaction known as Rydberg dressing is now exploited to entangle a pair of ultracold neutral atoms.

Subfields: Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/2d92b653c042455243f00c29de4cf35a25c9b955

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In Atomic and Molecular Physics, and Optics

Citations in the corpus

Quantum computing with atomic qubits and Rydberg interactions: progress and challenges (2016, methodology): “Reprinted by permission from Macmillan Publishers Ltd: Nature Physics [11], copyright 2015.”
Quantum simulation and computing with Rydberg-interacting qubits (2020, methodology): “These oscillations were ﬁrst observed in 2009, for two gr-qubits by Gaëtan et al. 168 and subsequently used to realize entangling operations for gr-41,82,83,169 and dressed gg-qubits 123 .”
Analysis of imperfections in the coherent optical excitation of single atoms to Rydberg states (2018, background): “Recent experimental efforts have shown an improvement in the fidelities of two-qubit gates [25,26], but they still remain below their theoretically predicted intrinsic fidelities [27,28] as compared to other experimental platforms, such as trapped ions [29,30] or superconducting qubits [31– 33].”